Functional Plasticity in Auditory and Visual Discrimination Processing in Patients with Single-Sided Deafness: An EEG...

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Sensory Processing

Background:

• Single-sided deafness (SSD) causes partial auditory deprivation, leading to unclear neural reorganization patterns.
• Conflicting previous findings highlight the need for homogeneous cohorts and consistent task designs.

Purpose of the Study:

• Investigate hierarchical neural processing in congenital single-sided deafness (SSD).
• Clarify the balance between residual auditory function and cross-modal plasticity in SSD patients.

Main Methods:

• Utilized electroencephalography (EEG) with auditory and visual oddball tasks.
• Compared 37 congenital SSD patients with 32 normal-hearing (NH) controls.

Main Results:

• SSD patients showed reduced early auditory components (N1, P2) and mismatch negativity (MMN).
• SSD patients exhibited increased early visual N1 amplitudes but intact later visual processing (vMMN, N2, P3).
• No significant latency differences were observed in any components.

Conclusions:

• Functional plasticity in SSD is prominent at sensory stages, with diminished auditory and heightened visual neural activity.
• Higher-level discrimination processing is largely preserved across modalities in SSD.
• Findings establish a hierarchical framework for neuroplasticity in partial sensory deprivation and inform rehabilitation strategies.